I don't know whether the books I (and apparently AstroNuc) used in school have been superseded by modern treatments, but I would suspect not (due to the decline in interest and hence departments of nuclear engineering since the early 1980s). I can tell you that looking around the engineering offices of *a major reactor vendor* that Lamarsh, Duderstadt&Hamilton, and Hetrick are on alot of bookshelves. See also Glasstone & Sesonke. These (especially the last three) are reactor physics books. If you're interested in the thermal-hydraulics / heat transfer (in addition to the neutronics) see El-Wakil (among others).

You can get the info you need by simply going though Lamarsh's Intro to Nuclear Eng book, then to Glasstone & Sesonske, and then to the Ott books. The Ott Reactor Statics book has an intro, but the material starts off presuming that you've had the basic reactor physics education from books like Glasstone & Sesonske.

Although "J.R.Lamarsh" is a standard in a lot of universities, I don't recommend it. It is a little bit old fashioned and lacks a lot of the numerical technics that are essential for reactor analysis.

I recommend
Nuclear-Reactor Analysis by Allan F. Henry
This book covers the same material in Lamarsh's book but it contains a good introduction for the numerical techniques used in reactor analysis . The last four chapters introduce more advanced approaches and techniques. In my opinion this is an amazing introduction to the subject.It is also the standard text at MIT.
Also Hamilton and Duderstadt is a nice book, and it has the advatage that it covers some related thermal-hydraulics, safety and control topics.

I'm actually using that at an Undergraduate level. It is a reasonable text, but lacks any good examples and the questions out of the book are extremely frustrating. Although I'd still suggest it if you like the theory like I do.

I picked up Stacey 1st ed from the library for self-study. It's pretty well organized, and I'm happy with it thus far. Even thinking about buying myself a copy of the 2nd ed to hold on to. I'd recommend you also grab the errata if you go for this one.

The other nice part is that the first half is set out as an undergrad level treatment, and the 2nd is set up as a higher level (graduate? advanced undergrad? professional reference? I dunno for sure).